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Topic Review (Newest First)

12-11-2005 06:53 AM

302 Z28

[QUOTE=Huskinhano]3 phase is a completely different animal then single phase. QUOTE]

Huskinhano nailed it...good call.

Vince

12-10-2005 06:56 PM

Mustangsaly

Quote:

Originally Posted by gator412

I was just trying to educate myself in what options I have here. As I stated I need 200 amp service in the building. I am going to have a licensed electrician do the work. My main question was can I get 200 amps single phase out of 150 amp three phase. So don't worry guys I won't do the work (I am a sheet metal worker not an electrician) and I hope that anyone doing any electrical work would get a licensed electrician to do it. Thanks, Gator

the service conductors of your 150a 3phase panel is prob not big enough 4 a 200a single phase panel, unless the wire was over sized. and if it was over sized, it was prob because of voltage drop or ambient tempaure or some reason, so it prob still isn't big enough big enough service feeder .

kinda guessing on wire size.........

12-09-2005 08:40 AM

gator412

I was just trying to educate myself in what options I have here. As I stated I need 200 amp service in the building. I am going to have a licensed electrician do the work. My main question was can I get 200 amps single phase out of 150 amp three phase. So don't worry guys I won't do the work (I am a sheet metal worker not an electrician) and I hope that anyone doing any electrical work would get a licensed electrician to do it. Thanks, Gator

12-08-2005 09:50 PM

Mustangsaly

Quote:

Originally Posted by oldred

I didn't say it was a trick and sure it it easy for someone familiar with doing it but to try and tell someone unfamiliar with it how to do it over the internet is just plain dangerous! I don't mean to take a slap at anyone when I say that an untrained person has no business in a 3 phase box it is just good common sense because one mistake could cause a lot of damage or even kill someone. With electrical power being as unforgiving as it is this is one thing that should be left to someone properly trained.

Gator, I know you already said you are having this done by a licensed electrician but for someone else thinking about "learning as I go" this is one area best left alone until after proper training.

I did Not Mean it that way, just ment its possible. I'm a Nebraska licensed electrician . it is hard to tell someone unfamiliar with it how to do it over the internet or in person most times.

12-08-2005 01:49 PM

oldred

I didn't say it was a trick and sure it it easy for someone familiar with doing it but to try and tell someone unfamiliar with it how to do it over the internet is just plain dangerous! I don't mean to take a slap at anyone when I say that an untrained person has no business in a 3 phase box it is just good common sense because one mistake could cause a lot of damage or even kill someone. With electrical power being as unforgiving as it is this is one thing that should be left to someone properly trained.

Gator, I know you already said you are having this done by a licensed electrician but for someone else thinking about "learning as I go" this is one area best left alone until after proper training.

12-08-2005 12:08 PM

Mustangsaly

Quote:

Originally Posted by oldred

Gator, That's sounds a lot better! I could not help but picture someone trying to figure out how get single phase power out of a 3 phase service, it's not that simple! Glad to hear you have help.

this is Not a Trick but very easy and common.........

12-08-2005 12:06 PM

Mustangsaly

all the 120 / 208 3 phase systems i've seen are 120v phase to ground (on all 3 phases) or 208 volts phase to phase, lota schools, older small grocery stores ect. around here have the 120 208 3phase systems. but most of the 120/240 3 phase systems have a wild leg (if not all 120/240 3 phase systems i've seen do) so 2 phases of a 120/240v 3 phase systems are 120 v to ground, and one of the 3 phases (the wild leg/high leg as we call it) are around 208 to ground. but any 2 phases of a 120/240 3phase system phase to phase is 240v. hope this helps.

Mustangsaly

12-08-2005 08:30 AM

Huskinhano

3 phase is a completely different animal then single phase. You have way more power then you think. At 150 amps, you have a lot more power availbe then a 200 amp single phase. A 200 amp, 240 volt sevice is 48 KVA, a 150 amp at 208 volts is 54 KV because it has a 1.73 factor to multiply it by for the third leg. Voltage on a 3 phase is going to depend on your transformer connection on the secondary side. Most likely you have a 120/208 volt service. This is called a "wye" connection. You could have a delta or open delta wich is a little more tricky is the sense you need to be more cautious in your 120 volt connect since you have only 2 of the three legs to take 120 volt fron. The other leg, often called the high or red leg has 208 volts to ground and will fry your stuff! If you have this connection, you should have a second panel dedicated to 120 volt circuit use. On the 120/208 volt, wye system it doesn't matter what leg you use for 120 volts as they all are 120 to neutral.

Usually small buidings with light loads will get the open delta system because the utility company can use 2 transformers instead of 3. If you have a 120/208 volt service, you need to be aware that any electric motors need to be rated for 208 volts and not just for 240 volts. I agree, this is a job for a pro to do!

12-08-2005 07:32 AM

oldred

Gator, That's sounds a lot better! I could not help but picture someone trying to figure out how get single phase power out of a 3 phase service, it's not that simple! Glad to hear you have help.

12-07-2005 08:38 PM

gator412

hahahahaha...I was not going to attempt this myself. I don't want to be lit up as a Christmas tree!. As I said I need 200 amp service into the building. Not that I need a 200 amp breaker! That would be one big motor! Anyway I called an electrician friend of mine and we went over it. Looks like I have 150 amp 3 phase into the building. Looks like they will be pulling some wire for me!
By the way there will be 8 commercial refrigerators, 2 freezers, commercial dishwasher, cloths washer and dryer. Not to mention the other stuff like lights computers etc. That is why I need 200 amp service.

Thanks guys for the help!

12-07-2005 08:15 PM

oldred

Gator, One thing is certain and that is you NEED an electrician to do this since this is definitely NOT a DIY project! No offense meant but unless you are absolutely sure how to do this then don't even think of getting into that three phase box! Someone may try and walk you through it and have nothing but the best intentions but if you misunderstand even one step it could be extremely dangerous. DON"T TRY THIS, GET PROFESSIONAL HELP!!

12-07-2005 07:16 PM

bigun

Just reread what you are asking for I have never seen a 200 amp 120V breaker. What are you trying to power??!!!!

12-07-2005 06:58 PM

oldred

I am pretty sure you will need to hook up a tran$former to get the proper power from this circuit.

12-07-2005 06:08 PM

bigun

Well I are one LOL, AS Henry said when you start messing with 3 phase you had better know what you are doing. I can generally talk people through work on a single phase panel, but working 3 phase had better be left for professionals. What is the voltage coming in? How do you Know that there is 200 Amps coming in, could there be a second panel that is getting part of the incoming amperage?

12-07-2005 04:51 PM

Henry Highrise

I am pretty sure you can get 120 volts single phase off of one leg. You really need an electrician working with that three phase stuff.

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